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Taxation - Taxation rate reconciliation and factors that may affect future tax charges (Details)
€ in Millions, £ in Millions
 12 Months Ended
Jun. 30, 2021
GBP (£)
Jun. 30, 2020
GBP (£)
Jun. 30, 2019
GBP (£)
Jun. 30, 2019
EUR (€)
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]        
Profit before taxation £ 3,706 £ 2,043 £ 4,235  
Notional charge at UK corporation tax rate 704 388 805  
Elimination of notional tax on share of after tax results of associates and joint ventures (63) (54) (59)  
Differences in overseas tax rates 128 53 106  
Effect of intra-group financing 0 (13) (34)  
Non taxable gain on disposals of businesses (2) 0 (3)  
Step-up gain 0 (2) 0  
Other tax rate and tax base differences 0 (47) (79)  
Other items not chargeable (52) (60) (51)  
Impairment 0 135 0  
Non deductible losses on disposals of businesses 0 6 0  
Other items not deductible 67 115 122  
Irrecoverable withholding taxes 25 36 24  
Movements in provision related to uncertain tax positions 1 6 98  
Changes in tax rates 78 45 (54)  
Fair value adjustment in respect of assets held for sale 0 0 1  
Adjustments in respect of prior years 21 (19) 22  
Taxation on profit £ 907 £ 589 £ 898  
Reconciliation of average effective tax rate and applicable tax rate [abstract]        
Notional charge at UK corporation tax rate 19.00% 19.00% 19.00% 19.00%
Elimination of notional tax on share of after tax results of associates and joint ventures (1.70%) (2.60%) (1.40%) (1.40%)
Differences in overseas tax rates 3.50% 2.60% 2.50% 2.50%
Effect of intra-group financing 0.00% (0.60%) (0.80%) (0.80%)
Non taxable gain on disposals of businesses (0.10%) 0.00% 0.00% 0.00%
Step-up gain 0.00% (0.10%) 0.00% 0.00%
Other tax rate and tax base differences 0.00% (2.30%) (1.90%) (1.90%)
Other items not chargeable (1.40%) (3.00%) (1.20%) (1.20%)
Impairment 0.00% 6.60% 0.00% 0.00%
Non deductible losses on disposals of businesses 0.00% 0.30% 0.00% 0.00%
Other items not deductible 1.80% 5.60% 2.90% 2.90%
Irrecoverable withholding taxes 0.70% 1.70% 0.60% 0.60%
Movements in provision related to uncertain tax positions 0.00% 0.30% 2.30% 2.30%
Changes in tax rates 2.10% 2.20% (1.30%) (1.30%)
Fair value adjustment in respect of assets held for sale 0.00% 0.00% 0.00% 0.00%
Adjustments in respect of prior years 0.60% (0.90%) 0.50% 0.50%
Taxation on profit 24.50% 28.80% 21.20% 21.20%
Tax rate before exceptional items 22.20% 21.70% 20.60% 20.60%
French tax audit settlement (v)        
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]        
Adjustments in respect of prior years     £ 61  
Taxation on profit £ 0 £ 0 £ 61 € 69